A reader wrote in with perhaps the most fun and “on-brand” question of all time. She’s invited to a 40th birthday party in Spain this September with a dress code of “Slim Aarons-inspired” (jealous!), but is stumped on what to wear. I’ve gathered lots of chic choices — all of which I want to wear myself. Read on for my picks!

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First things first, I went to the source: this Slim Aarons photo shot in Marbella, Spain.

SO dreamy, right?

Something breezy and flowy like a caftan or maxi dress would be ideal either in white or a colorful, happy hue like yellow, pink or blue. Jetset glamour is what you’re after.

September is still the end of summer and it should be warm in Spain, but not hot.